sigs.k8s.io/controller-runtime@v0.18.2/pkg/controller/controllerutil/example_test.go (about)

     1  /*
     2  Copyright 2018 The Kubernetes Authors.
     3  
     4  Licensed under the Apache License, Version 2.0 (the "License");
     5  you may not use this file except in compliance with the License.
     6  You may obtain a copy of the License at
     7  
     8      http://www.apache.org/licenses/LICENSE-2.0
     9  
    10  Unless required by applicable law or agreed to in writing, software
    11  distributed under the License is distributed on an "AS IS" BASIS,
    12  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
    13  See the License for the specific language governing permissions and
    14  limitations under the License.
    15  */
    16  
    17  package controllerutil_test
    18  
    19  import (
    20  	"context"
    21  
    22  	appsv1 "k8s.io/api/apps/v1"
    23  	corev1 "k8s.io/api/core/v1"
    24  	metav1 "k8s.io/apimachinery/pkg/apis/meta/v1"
    25  
    26  	"sigs.k8s.io/controller-runtime/pkg/controller/controllerutil"
    27  	logf "sigs.k8s.io/controller-runtime/pkg/log"
    28  )
    29  
    30  var (
    31  	log = logf.Log.WithName("controllerutil-examples")
    32  )
    33  
    34  // This example creates or updates an existing deployment.
    35  func ExampleCreateOrUpdate() {
    36  	// c is client.Client
    37  
    38  	// Create or Update the deployment default/foo
    39  	deploy := &appsv1.Deployment{ObjectMeta: metav1.ObjectMeta{Name: "foo", Namespace: "default"}}
    40  
    41  	op, err := controllerutil.CreateOrUpdate(context.TODO(), c, deploy, func() error {
    42  		// Deployment selector is immutable so we set this value only if
    43  		// a new object is going to be created
    44  		if deploy.ObjectMeta.CreationTimestamp.IsZero() {
    45  			deploy.Spec.Selector = &metav1.LabelSelector{
    46  				MatchLabels: map[string]string{"foo": "bar"},
    47  			}
    48  		}
    49  
    50  		// update the Deployment pod template
    51  		deploy.Spec.Template = corev1.PodTemplateSpec{
    52  			ObjectMeta: metav1.ObjectMeta{
    53  				Labels: map[string]string{
    54  					"foo": "bar",
    55  				},
    56  			},
    57  			Spec: corev1.PodSpec{
    58  				Containers: []corev1.Container{
    59  					{
    60  						Name:  "busybox",
    61  						Image: "busybox",
    62  					},
    63  				},
    64  			},
    65  		}
    66  
    67  		return nil
    68  	})
    69  
    70  	if err != nil {
    71  		log.Error(err, "Deployment reconcile failed")
    72  	} else {
    73  		log.Info("Deployment successfully reconciled", "operation", op)
    74  	}
    75  }